Stamping-press



Wrmzsszs ENVEN'T'O I I Q79 u Z. P. CANDEE.

- STAMPING PRESS.

APPLICATION FILED MAYI, 1919. 1,354,377, PatentedSept. 28,1920.

4 SHEETS-SHEE7 I.

Z. P. CANDEE.

STAMPING PRESS.

APPLICATION FILED MAY 1, 1919.

Patented Sept. 28, 1920.

4 SHEETS-SHEET 2.

Z. P. CANDEE.

STAMPING PRESS.

APPLICATION FILED MAY 1, 1919.

Patented Sept. 28, 1920.

4 SHEETS-SHEET 3- WITNESSES w Z. P. CANDEE.

STAMPING PRESS.

APPLICATION FILED MAY I. 1919.

Patented Sept. 28, 1920.

4 SHEETS-SHEE1 4.

WITNESSES F i4} 33 UNITED STATES PATENT OFFICE.

ZENAS P. CANDEE, OE WATERBURY. CONNECTICUT. AESIGNOR TO 'lI-ZE VIATERBURY- FAR-REL FOUNDRY AND CORPORATION OF CONNECTICUT.

GOEZPANY, VTATERBURY, CONNECTICUT, A

STAMPING-PRESS.

To all whom it may concern Be it known that I, ZnNAs P. CANDEE, a citizen of the United States, residing at a terbury, in the county of New Haven and State of Connecticut, have invented certain new and useful Improvements in Stamping- Presses, of which the following is a specification, reference being had therein to the ac. ompanying drawings.

My invention relates to a new and improved stamping press, having more particular reference to that type of press wherein the gate is operated through the action of the screw.

It is the object of this invention, among other things, to automatically actuate the screw of a press of this character and thus obviate the necessity of manipulating the same manually as heretofore, and further, to so operate the same that the pressure exerted by the tools upon the work during successive operations will be uniform, a result that is impossible of attainment with manually operated presses, another object being, to so design apress having these desirable features, that the mechanism will not be complicated but simple in both design and structure and easily and economicallyconstructed and assembled.

To these, and other ends, my invention consists in the new and improved stamping press having certain details of construction and combinations of parts as will be hereinafter described and more particularly pointed out in the claims.

Referring to the drawings, in which like numerals of reference designate like parts in the several figures: 1

Figure l is a front elevation of my impro ed press;

Fig. 2 is a side elevation thereof, partly in section; I

Fig. 3 is an enlarged plan View showing the relative position of some of the parts when the gate is inits down position;

Fig. 4 is a similar view with the gate in its up position;

Fig. 5 is a sectional view of the spring adjusting means. taken upon line 5-5 of Fig. 4; s

Fig. 6 is a fragmentary plan view of the clamp arm and adjacent mechanism;

Specification of Letters Patent. Patented Sept, 28, 1920 Application filed May 1, 1319.

Serial No. 294,124.

Fig. 7 is a sectional view of the parts shown in Fig. 6, taken upon line 77 thereof; 7

Fig. 8 is an enlarged plan view of the friction mechanism; and

Fig. 9 is a sectional view of the crank pin and adjacent parts, taken upon line 9-9 of Fig. 3.

l-leretofore screw presses have generally been operated manually, the operator grasping a handle or lever fixed to the upper portion of the screw and by rotation thereof the gate is caused to move toward the bed of the press and any work therebetween is acted upon by the dies, one of which is fixed in the bed and the other in the gate. This method of operation is, of course, costly, in that-it requires an operator for each machine, andthe pressure upon the work varice with the strength and activity of the operator so that two presses of exactly the same structure, operated by different persons will produce entirely different results on certain classes of work. This latter is especially true with work produced from th n metal, such as is required in the jewelry, optical and novelty trades.

Experience has demonstrated that not only does the character of the work produced vary between exactly similar machines operated by different persons but also varies throughout a working day in a single machine when operated by the same person, this depending upon the fatigue of the op- :rator.

in my invention the screw is operated automatically and the pressure of the tools upon the work is constant and the mechanism is so simple in its structure and assembling that it may be readily controlled and adjusted by a person with very limited me- =:-hanical knowledge and a single operator can with automatic feeding devices supervise the operation of a large number of group-ed machines.

In the drawings, the numeral 1 designates the frame of the machine, 2 the gate, 3 the wag s secured to the frame and in which the time is slidably mounted, adjusting screw 4 being provided through the side of the frame to adjust the relative positions of the w ys an d through it the friction upon the gate 2. In practice, these ways are adjusted so that the gate 2 moves qulte' freely therebetween.

Qn-the frame at 5 one of the pa1r of working dies or-punches is secured and the other one is secured in the gate at (3. These are brought together when the gate moves downwardly, and operate upon the work placed therebetween.

The mechanism above described constitutes no part of my present invention, as all of these elements have been heretofore combined in mechanism of this type and are old in the art. '15

' '7 erated upon, and the shape and structureof The character of the work that can be optlie dies and punches, can be and are varied indefinitely. in fact dles and tools of any structure can be mounted in this press, as in those of the prior art.

Threaded through a boss, 7 upon the top of the frame '1, is the operating screw 8, which has arotatable connectionwith the gate 27in a manner well known to the art and upon the upper end thereof is fixed 7 balance wheel 20.

and the upper and lower arms of the retaining yoke 9, are the washers 14, which prevent endwise movement of the keys 12 in relation to the collar 11.

On the-collar 11 is a clamp arm 15, which is adjustably secured thereto by a friction block 16 which lies within the pocket 17 in said clamp arm and is held against one side of the collar 11 by the adjusting screw 18 that is locked in its adjusted positions by V a. .jam nut l9.v

Fixed to the frame 1 is a bracket 21 having journaled therein a shaft 22, upon which is fixed a driving wheel 23 having connection by a belt or other means with any source of power, so that the shaft 22 is con- 7 tinuously driven in the direction of the arrow, shown in ,Fig. 2. g V

[Adjacent to the upper end of the shaft 22 is fixed the friction housing 24, within which is fitted a hardened friction ring 25, which be omitted ifdesired, although prefer to use it in most cases. Rotatably mounted upon the upper end of the shaft 22 is a crank plate 26, upon the hub of which is mounted a friction disk 2'? and held against rotation thereon by a plurality of pins 28. By this construction the friction disk 27 and crank plate 26, when assembled, are a unitary structure, and held bearing 80 between the friction dislr2'? and the housing 24. The friction disk 27 is provided with a plurality of peripheral notches 31, in the drawing three of such notches being shown, but the number may be varied if desired. Lying within each of these notches is a roll'32, which is mounted within a retaining saddle 33- pivotally secured to the friction disk 2'? by the pin 3 V A; spring pin 35 having contact with the retaining saddle 33, mounted in the friction disk 27, is actuated by a spring 36, and has a tendency to push the roll 32 away from said pin and in a direction parallel to that of the rotation of the housing 2 p In operation, shaft 22 and housing 2% are continuously rotated in thedirection shown by the arrow in Figs, 2 and 8, and through the frictional engagement of the rolls 32 with the inner face of the friction ring '25 and the long face of each of thenotches 81 in the frictiondisk 27 rotation is also im parted to the disk 27 and crank plate 26. If the irotarysp eed of the crank plate26 is greater than that of the housing 24, the friction rolls 32 release their grip uponthe inner face of'the ring 25 and the disk 27 will move independently of the housing 24. Rotation of the crank plate 26 and housing 24 as a unit is again obtained by reducing the speed of rotation of the friction disk 27, when'the rolls 32 will again take up their frictional contact with the ring 25.

The numeral 37 designates "the crank pin 7 having a head '38 thereon that isslidably mounted in the groove 39 in a lug 40 upon the crank plate 26. 'Mounted ,upon the shank of this crank pin 37 is a bushing al that projects through a block 42slidably mounted in the opening 43 in the crank arm 44. that is closed at one end by; the, cap 47. A collar a5 ant a nut 46 hold the bushing and block justdescribed against endwise movement in relation to the crank plate, and provide means whereby the crank pin 37 may be held in any of its radial positions in relation to theccnter of the crank plate 26. The radial position of the crank pin 37 is varied by means of an adjusting screw threaded into,;the crank pin 37 ,and held against endwise movement the lugs 53 upon the upper surface of the crank plate 26. The block 42 has a flexible connection with the crank arm 44 through springs 48 upon eitherside thereof. one end of each of said springs being against said block and the other end against the nuts 49 threadably mounted upon the fixed studs 50, one o these studs being fixed in the cap i? and the other in the crank arm The extent of the flexibility may be varied by manipulation of the nuts 49 so as to vary the pressure of the spring upon the said block 42.

A pin 51 provides a pivotal connection between crank arm 4 1 and the clamp arm 15.

To operate the press the tools are arranged in a proper predetermined position. This is accomplished by adjusting the relativeposition of the gate 2 with the bed 5 and is secured by releasing thehold of the friction block 16 upon the collar 11 and then rotating the screw through manipulation of the balance wheel 20 until the gate is in its correct position. The screw 18 is now manipulated forcing the friction block 16 against the bushing 11 and providing a rigid connection between the clamp arm 15 and screw 8. The position of the gate above described is what is known as the down position, at which time the crank plate, crank arm and clamp arm 15 are in substantially the relative positions shown in Fig. 3.

It being borne in mind that if nothing intervenes to prevent, the crank plate 26 rotates with the housing 24 in the direction shown by the arrow in said figure, and from the point shown inFig. 3, which may be con{ sidered for convenience of description, as

the zero position, say for 180 or more, 1OV6S the clamp arm 15 from the position shown in Fig. 3 to substantially that shown} in Fig. 4, and during this rotation the screw is rotated through the collar 11 and keys 12, raising the gate to its up position, during all of which time the friction rolls 82 are in contact with the ring 25. After the crank pin passes this point the crank arm pushes the clamp arm 15 back tothe position shown in Fig. 3 for a number of degrees more or less, undetermined or until the linear velocity of the pin 51 due to the momentum of the fly or balance wheel 20 becomes greater than the linear velocity of the crank pin 37. Then this occurs the crank plate'26 will be drawn ahead ofthe driving shaft 22 and friction housing 2 1, releasing the hold of the friction rolls 32 upon'the ring 25, and the screw under the action of the momentum of the fly wheel 20 will run free and uninfluenced by the rotation of the shaft 22. This continues until the blow of the tool in the gate upon the work causes the gate to rebound slightly. When this occurs the rotary action'of the crank pin 37 is retarded slightly and the rolls 32 are again brought into engagement with the inner surface of the ring 25 and the screw is returned through the rotation of the crank pin from the shaft 22. lVith this mechanism, with the shaft 22 rotating at a constant velocity, the energy stored up in the fly wheel 20 will always be the same and the blow struck on the work will not vary, as is the case with the hand driven screw press.

lVithin the limi s of the appended claims, the details of the construction of my imoroved stamping press may be considerably altered and varied, and I would therefore have it understood that I do not limit myself to the construction herein shown and described but claim all that falls fairly within the spirit and scope of my invention.

Having described my invention, what I claim as new and desire to secure by Letters Patent, is:--

1. The combination in a screw press; of a driven element; a clutch; and means for automatically rotating the screw of said press in opposite directions from said driven element through said clutch.

2. In mechanism of the character described, the combination with the screw; of a continuously rotating element; a make and break device interposed between said screw and rotating element; and a connection between said screw and make and break device, said connection in part actuating said make and break device according to the direction of rotation and relative speed of said screw.

3. In mechanism of the character described, the combination with the screw; of a continuously rotating element; and means for positively operating said screw in both directions from said rotating element, said means being in part controlled by the rela tive speed of said screw.

4. The combination in a screw press; of a driven element; a clutch means for automatically rotating the screw thereof in opposite directions from said driven element through said clutch; and means whereby the point, when said screw changes its direction of movement, may be relatively varied.

5. The combination in a screw press; of driven element; a clutch means for automatically rotating the screw thereof in opposite directions from said driven element through said clutch; means whereby the point, when saic screw changes its direction of movement, may be relatively varied; and means for varying the length of stroke of said screw.

6. In mechanism of the character described, in combination wi 11 the screw; of a continuously rotating element; a connection having an operrtive engagement with said screw; and a make and break mechanism between said rotating element and said con nection.

7. In mechanism of the character described, in combination with the screw; of a rotary element; a connection having an op} erative engagement with said screw; a make and break mechanism between said rotary element and said connectlon; and means for rotation ofsaid screw when in one of its posit ons, then permittlng the same to run free, and at the termination of its i'reerun, mechanically rotating the same in the reverse direction, said free run and the start- .ing of the mechanical rotation of the screw in the saidreverse direction being dependent in part upon the relative speed oi rotation of said screw. p 7

10. In mechanism of the character described, in combination with the screw; of momentum device connected with said screw; mechanism for mechanically starting the rotation of said screw whenin one of its positions, then permitting the same to run free under the impulse of said momentum device, and at the termination of its free run, mechanicallyrotating the same in the re' *ersedirection, said iree run and the star ing of the mechanical rotation of the screw in the said reverse direction being dependent I in part upon the relative speed-of rotation of said screw. r

,11.-In mechanism 01 the character described, the combination with the screw; of a rotary element; a connection betweensaid screw and rotary element, including means wherebysaid screw will acquire a speed greater than said rotary element; andmeans for operatlvely connecting said connection with said rotaryelement whereby its engagement therewith will be released under such increased speed. -12. In mechanism of the character de: scribed, the combination with the screw ;-of a rotary element; means for rotating -ll1e same continuously in one direction; a connection having a permanent engagement with said screw and a make and breakconnection with said rotary element, the arrangement of'said make and break connec tion being such that said screw is operated from said rotary element except 'when the speed of rotation thereof exceeds that of said rotary element.

13. In mechanism of the character described, the combination with a screw; of a radial arm connected therewith; a continuously rotating member; a connection havinga pivotal engagement with said arm; and a make and break mechanism between said connection and said rotating member.

14. In mechanism of the character described, the combination with a screw; of an arm connected therewith; means for securing said arm to said screw, so that its relative longitudinal position on said screw may be varied; a continuously rotating member; a connection having a pivotal engagement with said arm; and a make and break mechanism between said connection and said r0- tating. member. 7 i

15. In mechanism of the character described, the combination with a screw; or" an arm connected therewith; a rotary member; a crank plate; a connection having an operativeengagement with said arm; means whereby said connection may have a flexible engagement with said crank plate; and a clutch mechanism having a separable operative engagement with'said crank plate androtary member.

16. In mechanism of the character described, the combination with a screw ;'of an arm connected therewith; a rotary member; a crank plate; a connection having an operative engagement with said arm; means whereby said connection may have a flexible engagement with said crank plate; a clutch mechanism having a separable operative engagement with said crank plate and rotary member and means for varying the relative position. of the mechanism uniting said crank plate and connection. n lTIn mechanism of the character de- .-rcribed,the combination with a screw of an arm connected therewith; means for adjustably securing said armto said screw; a.

crank plate; a connection between said crank plate and arm having a fiexibleenga'gement with the former and a pivotalconnection with the latter; arotary member; and a clutch between said crank plate and rotary member. 7 "18. In mechanism bfjthe character described, the combination with'a screw; of an arm connected therewith; means for adjustably-securing said arm to said screw; a

crank plate; a connection between said crank plate and arm having a flexible engagement with the former and a pivotal connection with the latter; a rotary member; and a clutch between said crank plate and rotary member, the arrangement of such elements being such that the said clutch is operated in one direction by said rotary member and in the fopposite direction through saidcrank'platewe r 19. In mechanism-ofthe character described, the combination with a screw; of a momentum member connected therewith;

a rotating member continuously rotating in the same direction; a crank plate; a clutch between said crank plate and rotary memher, the action of which is in part controlled by the speed of rotation of said crank plate, running free when rotating at a speed greater than said rotary member; and a connection between said screw and said crank plate.

20. In mechanism of the character described, the combination with a screw; of a continuously rotating element; a connection between said screw and rotating element, said connection comprising in part. a make and break device so arranged and operated that parts thereon engage with said rotary element when the latter is moving at a speed greater than that of said screw but said parts are disengaged therefrom when said screw is rotating at a speed greater than said rotary element.

21. In mechanism of the character de scribed, the combination with a screw; of an arm connected therewith; a rotary member; a connection having a pivotal engagement with said arm; a make and break mechaiism between said connection and said rotary member; and flexible elements between said connection and the rigid part on said crank plate.

22. In mechanism of the character described, the combination with a screw; of an arm connected therewith; means for adjustably securing said arm to said screw; a crank plate; a connection between said crank plate and arm having a flexible engagement with the former and a pivotal connection with the latter; a rotary memher; a clutch between said crank plate and rotary member; and means for varying the tension oi": said flexible engagement.

23. in mechanism of the character described, in combination with the screw; of a rotary element; a connection having an operative engagement with said screw; a crank plate; a make and break connection between said crank plate and rotary element; a rigid element mounted on said crank plate; a tension mechanism joining said connection and rigid element; and means for varying the tension of said tension mechanism.

24. In mechanism of the character described, in combination with the screw; of a rotary element; a connection having an op-- erative engagement with said screw; a crank plate; a make and break connection between said crank plate and rotary element; a crank pin on said plate; a tension mechanism joinino said connection and crank pin, comprisng companion springs, one upon each side if said crank pin; and means for varying he tension of either or both of said springs.

25. In mechanism of the character described, in combination with the screw; of a rotary element; a connection having an operative engagement with said screw; a crank plate; a make and break connection between said crank plate and rotary element; a crank pin on said pia e; a tension mechanism joining said connection anu crank pin, comprising companion springs, one upon each side of said rank pin; means for varying the tension of either or both of said springs; and means for varying the relative position of said crank pin on said crank plate.

26. In mechanism of the character described, the combination with the screw; of a rotary element; means for rotating the same continuously in one direction; a connection having a permanent. engagement with said screw and make and break connection with said rotary element, the arrangement of said make and break connection being such that said screw is operated from said rotary element except when the sneed of rotation thereof exceeds that of said rotary element and again restored when the said screw comes to a stop or its speed is equal to or less than that of said rotary element.

27. In mechanism of the character described, the combination with a screw; of a continuously rotating element; a rotatably mounted member; a movable part on said member arranged so that in one of its positions it forms a medium whereby a rigid connection is made between said rotary element and said rotatably mounted member and both rotate in unison, and in another of its positions will break said connection so that said rotatably mounted member is free and independent of said rotating element; and a connection between said rotatably mounted member and said screw.

28. In mechanism of the character described, tne combination with a screw; of a momentum device thereon; a rotary memher: and means for connecting said screw and rotary member so that said screw will be rotated by said rotary member until the speed of said screw exceeds that of said rotary member when it will be released from said rotary member and run free.

In testimony whereof I have hereunto affixed my signature.

ZENAS P. CANDEE. 

